Add GrResourceCache2.

Currently it just replaces GrGpu as the owner of the linked list of resources.

Committed: https://skia.googlesource.com/skia/+/94ce9ac8624dbb45656b8f5c992fad9c9ff3ee5f

R=mtklein@google.com, robertphillips@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/481443002
17 files changed